Chilled castings



Waas-m- IOHN REIOHENBAOH, OF ALLEGHENY CITY, PENNSYLVANIA, ASSIGNOR TO HIMSELF,

JOHN HEATH, AND WILLIAM R. FITZSIMONS, OF SAME PLAGE.

Lmm Patent Nm-89,076, dated April 2o, 1869.

COIPOSITION FOR. MAKING CHILLED CASTINGS.

.The Schedule referred to in these Letters Patent and making part of the uma.

ment in Mixture for Chilled ACastings and I- do hereby Y declare the following to be a full, clear, and exact description thereof, reference'being had to the accompanying drawing, making a part of this specification, in which- Flgure 1 is a cross-section of a flask, in which is a series of moulds for casting nuts, with chills in place for forming the threaded eye in each of the nuts;

Figure 2 is a side view of a threaded metallic chill; and

Figure 3 is a section of a cast-metal nut, as formed by a plane passing longitudinally along the axis of the eye 'of the nut.'

Inmaking chilled casting heretofore, ithas generally been found necessary to remove .the casting from the chill as soon the metal was fairly set, in order to prevent their becoming inseparably united, and this fact has rendered it implacticable to employ a chill in casting many articles; especially is this true in respect to all castings, where the chill cannot be immediately removed,as in castings in which a chilled face is desired on two or more sides, also in casting metal nuts with threaded chilled eyes, and in casting many other articles of like character.

My invention is designed to obviate this diculty,

. and the nature of it consists in coating the chill before the casting-is done, with a solution of gum-shellac, which, when dry, -leaves a thin crust on the chill, againstor on which to teem the molten metal.

To enable others skilled in the art to make use of my invention, I will proceed to describeit, and itsI manner of use, illustrating it more particularly by a de- .sorlption of its application to the casting of threaded nuts.

a is a threaded chill of the form of a screw, andrb -The threaded chill a, I placecentrally in a'mould of the proper size and shape for forming. the outer face of the* nut, or more commonly arrange a number. of su'ch'lchills, one in each of a series of nut-moulds, c,

as sh'own in fig. 1, in which d is the flask, and ff'. the

sand-mould.

The nuts, or patterns for forming the nut-moulds, or cavities c, are screwed on to the chills a, and the mould formed in the usual way, gates e Aand sprues e being made at the same time for the usual purposes. .Having then removed the upper part f of the mould,

the nuts and chills o are taken out andthe nuts screwed In making the mixture, I take the ingredients named, in about the proportion of one-half pint of alcohol, one ounce gmn-shellac, and a table-spoonful of lamp-black. The gum-shellac is dissolved in the alcohol, and the lamp-black i's added.

This mixture being appliedto-the tace of a chill, et'- fectually prevents 'melted iron from forming a solid union therewith.

The' chills a being coated with this mixture, they are replaced in the4 cavities e, the upper part f ofthe flask is replaced, and the casting proceeds.

The metal is turned in at one gate e', flows along the cavities c, through the sprues e, till all are full.

. When it is set, the cast nuts are removed, brokenapart, turned oil', each -from its `chill a, and thereby are produced nuts, each Awith a perfectly formed chilled threaded eye, as shown in section in fig. 3.

The mixture described, forms a thin crust on the face of the chill, the alcohol readily evaporating, and such crust so far resists the action of the heat of the melted metal, as to prevent the meltedmetal from forming a fixed union with the chill.

The same is true, even if the newly formed casting remain on or in contact with the' chill till it is cold. It can still be easily removed.

In the application of the composition, orA mixture described, I do notlimit myself to the manufacture of nuts, but extend it' to making allkinds of chilled castings.-

LLhe face of the chill againstwhich the casting is to be done, is coated with the mixture described, with the result already stated.

` If the castings to be made are large, I sometimes sprinkle a littlevsand on the chill after it is .coated with this mixture, in order to give additional body to the coating, but in small castings, the gum-shellac and lamp-black give all the coating that is required. In this way I am enabled to chill any or all faces of a casting, no matter how numerous they may be,'or how irregular their forms, and can also produce chilled castings more economically since the workof casting need not be interrupted to remove the casting from its chill, lest the two forma solid union.

What I claim as my invention, and desire to secure by Letters Patent, isy As a coating for the chill in making chilledcastings, a mixture of gum-shellac, alcohol, and lamp-black, in the proportions, and used' substantially as stated.

In testimony whereof, I, the said J ons Rnxcnnn- BAOH, have hereunto set my hand.

. JOHN REIOHENBAOH. Witnesses: 1

A. S. NICHOLSON,

` G. H. Ormrsrr. 

